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Petrolina weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Petrolina?
For a warm holiday, the best week has been 15–21 July (Weather Index 97). Favourable start dates for a 7-day trip run from 6 July to 29 July. October, November and December are warmest (35°C), September is driest and October has the most sun.
- Warmest
- October, November and December 35°C
- Coolest
- July 30°C
- Driest
- September 0% rain-day chance
- Wettest
- January 27% rain-day chance
- Sunniest
- October 12 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Petrolina
Petrolina historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 33.7 | 23.8 | 27.1 | 8.4 | 71.1 | 10.8 |
| February | 33.9 | 23.7 | 26.4 | 7.4 | 44.8 | 11.2 |
| March | 34.2 | 24.0 | 21.6 | 6.7 | 45.9 | 11.0 |
| April | 33.4 | 23.5 | 16.7 | 5.0 | 37.5 | 10.6 |
| May | 32.0 | 22.3 | 7.7 | 2.4 | 15.6 | 9.4 |
| June | 30.8 | 21.0 | 2.7 | 0.8 | 4.0 | 9.1 |
| July | 30.3 | 20.1 | 2.3 | 0.7 | 2.6 | 9.4 |
| August | 31.7 | 20.2 | 1.6 | 0.5 | 2.1 | 10.4 |
| September | 33.6 | 21.3 | 0.0 | 0.0 | 0.9 | 10.8 |
| October | 35.5 | 22.8 | 5.8 | 1.8 | 8.9 | 11.6 |
| November | 34.7 | 23.6 | 14.7 | 4.4 | 32.4 | 11.4 |
| December | 34.7 | 23.8 | 15.8 | 4.9 | 30.9 | 11.5 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.